Have someone pull the cable release and try slapping the hood with the palm of your hand. Sharp blows right above the latch should dislodge the mechanism, and allow the return spring to pop the hood.
I think the hood part is scraping the sides of the bottom. So, it may be that the latch is unclasping, but the mating parts are just hung on each other by friction. It's worth a try.
Here are some diagrams of your hood latches. Which lever do you think is missing? (They are numbered) - Dave